Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc62675520ad1c7b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 20:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 141ab82b7a134816108d4e222c35fbd0 SHA-1: 1870e1014af82209f06d26ccd5fb345ccd4eaae2 SHA-256: cc62675520ad1c7b2ee6c8bb099e1e17d09f8dc98eee14bb3413f904285f5cbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://benthanhsgfarm.com/images/uploads/files/tenemufetixiwo.pdf In PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9615186600.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/25292911600.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/19953834231.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/mabafazapalaliwoluxola.pdfIn PDF document text
    • http://mobitransjogja.com/files/56708792677.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/56082433889.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/68569080276.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/81594734947.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/samujekesisepesanakutor.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/gegox.pdfIn PDF document text
    • https://rajakedua.com/contents/files/guxewapakasenoxu.pdfIn PDF document text
    • http://suurelepa.ee/data/file/65734356393.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/bekoxa.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kavekonamagura.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/67699493127.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/jinutaz.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370fc58c231---53786907729.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/rutij.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/v00hi78pkjqgj03uprrc1fk4uo/wisokebugozava.pdfIn PDF document text
    • http://isvpro.com/custom/files/57932853165.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/joreruwakilap.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/wuwolajona.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/xobukaxelixopejibuwafed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wagner+power+painter+2200+psi+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 19324 bytes
SHA-256: 994d4051dacfaa5774751794bfa3183ef417cd633aadc7075912780a06043b79
font_01_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 11016 bytes
SHA-256: 0727bf1344cbcfb8173d6e0362bf52d9c00e02bd52f32d625fc30bc90f7d9542
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1